Straddle crane apparatus

Details Straddle crane apparatus Straddle crane apparatus

1978-11-09

1980-08-26

Sheridan, Robert G.

Motor vehicles

Having four wheels driven

With means for steering all driven wheels

29469, 52729, 52731, 180242, 180253, 403262, 414460, B60P 102, B66C 502

Patent

active

042190940

ABSTRACT:
A straddle crane including four vertical column members, two side beam or torsion members, and at least one header beam member, and having wheel or caster assemblies supporting each vertical column member. The straddle crane is implemented for two-wheel or four-wheel steering and for two-wheel or four-wheel driving with open or closed ends. The structures of the header beam and the side beam members are appropriately selected, and the attachment means therefor to the vertical column members are chosen to accommodate the various forces and stresses occurring on the structure during normal operation over uneven terrain or surfaces. The header beam member is sufficiently flexible to permit movement of the casters over and in contact with uneven terrain without producing unacceptable shear stresses in the header beam member. The torsion beam member defines a closed geometric figure in cross section to provide torsional and bending resistance to the loads applied to the vertical columns.

REFERENCES:
patent: 3251433 (1966-05-01), Hintze et al.
patent: 3356239 (1967-12-01), Klein
patent: 3640413 (1972-02-01), Klein
patent: 4054392 (1977-10-01), Oppenheim

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